Gamemanager: replace full-page log refresh with in-place AJAX tailing

[Copilot]

The Game Manager log view was refreshing the full page on each interval tick, which reset user context (scroll/nav/mobile viewport) and caused flicker during log watching. This change converts the view to incremental in-place log updates so only log content refreshes.

• Log refresh architecture

  • Added Panel/modules/gamemanager/ajax_log.php as a lightweight endpoint returning raw log text for home_id/mod_id/ip/port.
  • Endpoint enforces session/authz checks and validates requested home/IP:port access before returning log output.
  • Response is non-cached (Cache-Control/Pragma/Expires) to ensure fresh polling reads.

• UI refresh behavior (Panel/modules/gamemanager/log.php)

  • Removed page-level refresh workflow for log updates (no redirect/full reload path for interval updates).
  • Replaced with JS polling that updates only #gm-log-output.
  • Interval selector now includes 1s, 2s, 4s, 8s, 30s, 2m, 5m; default remains 4s.
  • Interval changes re-arm polling immediately without reloading page state.

• Scroll-state preservation

  • Added bottom-follow detection (<= 50px from bottom).
  • Auto-scroll occurs only when user is already following tail; otherwise current read position is preserved.

• Operational visibility

  • Added explicit client logs:
    • Log refresh started...
    • Log refresh successful...
    • Log refresh failed...

function refreshLog() {
  console.log('Log refresh started...');
  var shouldFollow = isFollowingBottom();
  $.ajax({ url: endpoint, cache: false, dataType: 'text' })
    .done(function(data) {
      if (data !== lastLogText) {
        $log.text(data);
        lastLogText = data;
        if (shouldFollow) scrollToBottom();
      }
      console.log('Log refresh successful...');
    })
    .fail(function(_, textStatus, errorThrown) {
      console.log('Log refresh failed...', textStatus, errorThrown);
    });
}

[Copilot]

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